<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc,index) in starClasses" :key="index" :class="sc"></span>
    </div>
</template>
<style lang="stylus" rel="stylesheet/stylus">
@import "../../common/stylus/mixins.styl";
.star //2x图 3x图
    float left
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('./images/star48_on')
        &.half
          bg-image('./images/star48_half')
        &.off
          bg-image('./images/star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star36_on')
        &.half
          bg-image('./images/star36_half')
        &.off
          bg-image('./images/star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star24_on')
        &.half
          bg-image('./images/star24_half')
        &.off
          bg-image('./images/star24_off')
</style>
<script>
// 根据图形显示分数
    const CLASS_ON = 'on'
    const CLASS_HALF = 'half'
    const CLASS_OFF= 'off'
export default {
    props:{   //当我们使用组件标签的时候  需要传属性  考虑下用什么  先用上先别写其他的
    //确定完props  就可以使用了
        score: Number,
        size:Number
    },
    computed:{
        starClasses(){
            const {score} = this
            const scs = []
            //向 SCS 中 添加N个CLASS_ON       总个数是5个
            const scoreInteger = Math.floor(score)
            for (var i = 0;i < scoreInteger; i++){
                scs.push(CLASS_ON)
            }
            //向 SCS 中 添加0/1个
            if (score*10 - scoreInteger*10 >= 5){
                scs.push(CLASS_HALF)
            }
            //向 SCS 中 添加N个CLASS_OFF
            while(scs.length<5){
                scs.push(CLASS_OFF)
            }
            return scs
        }
    }
}
</script>